Astm e 1495 e 1495m 17

Designation: E1495/E1495M − 17

Standard Guide for

Acousto-Ultrasonic Assessment of Composites, Laminates,

and Bonded Joints1

This standard is issued under the fixed designation E1495/E1495M; the number immediately following the designation indicates the year

of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.

A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.

1. Scope*

1.1 This guide explains the rationale and basic technology

for the acousto-ultrasonic (AU) method. Guidelines are given

for nondestructive evaluation (NDE) of flaws and physical

characteristics that influence the mechanical properties and

relative strength of composite structures (for example,

filament-wound pressure vessels), adhesive bonds (for

example, joints between metal plates), and interlaminar and

fiber/matrix bonds in man-made composites and natural com￾posites (for example, wood products).

1.2 This guide covers technical details and rules that must

be observed to ensure reliable and reproducible quantitative

AU assessments of laminates, composites, and bonded struc￾tures. The underlying principles, prototype apparatus,

instrumentation, standardization, examination methods, and

data analysis for such assessments are covered. Limitations of

the AU method and guidelines for taking advantage of its

capabilities are cited.

1.3 The objective of AU is to assess subtle flaws and

associated strength variations in composite structures and

bonded joints. Discontinuities such as large voids, disbonds, or

extended lack of contact at interfaces can be assessed by other

NDE methods such as conventional ultrasonics.

1.4 Additional information may be found in the publications

cited in the list of references at the end of this guide. The

referenced works provide background on research,

applications, and various aspects of signal acquisition,

processing, and interpretation.

1.5 Units—The values stated in either SI units or inch￾pound units are to be regarded as standard. The values stated in

each system may not be exact equivalents; therefore, each

system shall be used independently of the other. Combining

values from the two systems may result in non-conformance

with the standards.

1.6 This standard does not purport to address all of the

safety concerns, if any, associated with its use. It is the

responsibility of the user of this standard to establish appro￾priate safety and health practices and determine the applica￾bility of regulatory limitations prior to use.

1.7 This international standard was developed in accor￾dance with internationally recognized principles on standard￾ization established in the Decision on Principles for the

Development of International Standards, Guides and Recom￾mendations issued by the World Trade Organization Technical

Barriers to Trade (TBT) Committee.

2. Referenced Documents

2.1 ASTM Standards:2

E543 Specification for Agencies Performing Nondestructive

Testing

E1316 Terminology for Nondestructive Examinations

2.2 ASNT Standard:3

ANSI/ASNT CP-189 Standard for Qualification and Certifi￾cation of Nondestructive Testing Personnel

SNT-TC-1A Recommended Practice for Personnel Qualifi￾cations and Certification in Nondestructive Testing

2.3 AIA Document:4

NAS-410 Certification and Qualification of Nondestructive

Testing Personnel

2.4 ISO Standard:5

ISO 9712 Non-Destructive Testing: Qualification and Certi￾fication of NDT Personnel

3. Terminology

3.1 Definitions:

1 This guide is under the jurisdiction of ASTM Committee E07 on Nondestruc￾tive Testing and is the direct responsibility of Subcommittee E07.04 on Acoustic

Emission Method.

Current edition approved June 1, 2017. Published June 2017. Originally

approved in 1992. Last previous edition approved in 2012 as E1495 - 12. DOI:

10.1520/E1495-17.

2 For referenced ASTM standards, visit the ASTM website, www.astm.org, or

contact ASTM Customer Service at [email protected]. For Annual Book of ASTM

Standards volume information, refer to the standard’s Document Summary page on

the ASTM website. 3 Available from American Society for Nondestructive Testing (ASNT), P.O. Box

28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org. 4 Available from Aerospace Industries Association of America, Inc. (AIA), 1000

Wilson Blvd., Suite 1700, Arlington, VA 22209-3928, http://www.aia-aerospace.org.

5 Available from International Organization for Standardization (ISO), ISO

Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier,

Geneva, Switzerland, http://www.iso.org.

*A Summary of Changes section appears at the end of this standard

Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the

Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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